/* 基础样式 */
body {
  font-family: Arial, sans-serif;
  background: #f5f5f5;
  margin: 0;
  padding: 40px;
}

/* 卡片样式 */
.card-container {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: center;
}

.card {
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  width: 240px;
  padding: 24px;
  text-align: center;
  cursor: pointer;
  transition: box-shadow 0.2s;
}

.card:hover {
  box-shadow: 0 4px 16px rgba(0,0,0,0.18);
}

.card-title {
  font-size: 20px;
  margin-bottom: 12px;
  color: #333;
}

.card-desc {
  color: #666;
  font-size: 14px;
}

/* 通用容器样式 */
.container {
  max-width: 600px;
  margin: 40px auto;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  padding: 32px 24px;
}

/* 标题样式 */
h1 {
  text-align: center;
  color: #1976d2;
  margin-bottom: 32px;
  letter-spacing: 2px;
}

/* 表单元素样式 */
label {
  display: block;
  margin-bottom: 8px;
  color: #333;
  font-weight: bold;
}

/* 输入框样式 */
input[type="text"], 
input[type="number"] {
  width: 100%;
  padding: 8px 10px;
  margin-bottom: 20px;
  border: 1px solid #ccc;
  border-radius: 6px;
  font-size: 16px;
}

/* 按钮样式 */
button {
  width: 100%;
  padding: 12px;
  background: #1976d2;
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 18px;
  cursor: pointer;
  transition: background 0.2s;
}

button:hover {
  background: #125ea2;
}

/* 文件按钮样式 */
.file-btn {
  display: inline-block;
  background: #1976d2;
  color: #fff;
  padding: 8px 18px;
  border-radius: 6px;
  font-size: 15px;
  transition: background 0.2s;
}

.file-btn:hover {
  background: #125ea2;
}

/* 选择框样式 */
select {
  width: 100%;
  padding: 8px 10px;
  margin-bottom: 20px;
  border: 1px solid #ccc;
  border-radius: 6px;
  font-size: 16px;
  background: #fff;
  color: #333;
  appearance: none;
  outline: none;
  box-shadow: none;
  transition: border 0.2s;
}

select:focus {
  border: 1.5px solid #1976d2;
  background: #f0f7ff;
}

/* 文件标签样式 */
.file-label {
  position: relative;
  cursor: pointer;
}

/* 复选框样式 */
.checkbox-label {
  display: flex;
}

.checkbox-label input[type="checkbox"] {
  margin-right: 6px;
  accent-color: #1976d2;
  width: 18px;
  height: 18px;
}

/* 布局样式 */
.form-row {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 10px;
}

.btn-row {
  display: flex;
  gap: 16px;
  margin-top: 16px;
}

/* 结果显示样式 */
.result {
  margin-top: 24px;
  font-size: 16px;
}

/* 预览图片样式 */
.preview-img {
  max-width: 100%;
  max-height: 180px;
  margin-top: 8px;
  border: 1px solid #eee;
  border-radius: 6px;
}

/* 更新日志样式 */
.changelog-container {
  max-width: 700px;
  margin: 40px auto;
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  padding: 32px 28px;
}

.changelog-title {
  font-size: 2em;
  font-weight: bold;
  margin-bottom: 18px;
}

.changelog-list {
  list-style: none;
  padding: 0;
}

.changelog-list li {
  margin-bottom: 24px;
  border-left: 4px solid #4caf50;
  padding-left: 16px;
}

.changelog-date {
  color: #888;
  font-size: 0.95em;
  margin-bottom: 4px;
  display: block;
}

.changelog-content {
  font-size: 1.08em;
}

/* 滑块样式 */
.slider-container {
  margin-bottom: 20px;
}

.slider-row {
  display: flex;
  align-items: center;
  margin-bottom: 15px;
}

.slider-label {
  min-width: 120px;
  margin-right: 15px;
  font-weight: bold;
}

.slider-input {
  flex: 1;
  margin-right: 15px;
}

.slider-value {
  min-width: 60px;
  text-align: right;
  font-weight: bold;
  color: #1976d2;
}

/* 范围滑块样式 */
input[type="range"] {
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: #ddd;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #1976d2;
  cursor: pointer;
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #1976d2;
  cursor: pointer;
  border: none;
}

/* 关于页面样式 */
.about-content {
  line-height: 1.6;
}

.about-content h2 {
  color: #1976d2;
  margin-bottom: 16px;
}

.about-content h3 {
  color: #333;
  margin: 24px 0 12px 0;
}

.qq-groups {
  display: flex;
  gap: 24px;
  margin: 20px 0;
  justify-content: center;
}

.qq-group {
  text-align: center;
  padding: 20px;
  background: #f8f9fa;
  border-radius: 8px;
  border: 2px solid #e9ecef;
  min-width: 120px;
}

.qq-group h4 {
  margin: 0 0 8px 0;
  color: #1976d2;
  font-size: 18px;
}

.qq-number {
  font-size: 20px;
  font-weight: bold;
  color: #333;
  margin: 0;
  font-family: 'Courier New', monospace;
}

.qq-link {
  text-decoration: none;
  color: inherit;
  display: block;
}

.qq-link:hover .qq-number {
  color: #1976d2;
}
:root {
  --ink: #000;
  --muted: #888;
  --line: #e5e5e5;
  --bg: #fff;
  --max: 720px;
  /* 按钮变量 */
  --surface: #fff;
  --text: #111;
  --text-muted: #777;
  --border: #e0e0e0;
  --radius: 2px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
               'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

article.page {
  max-width: var(--max);
  margin: 0 auto;
  padding: 4rem 1.5rem 3rem;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 3rem;
  font-size: 0.8rem;
  color: var(--muted);
}

.page-h1 {
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0 0 0.5rem;
  color: var(--ink);
  text-align: left;
}
.subtitle {
  color: var(--muted);
  font-size: 0.95rem;
  margin: 0 0 3rem;
}

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin: 2.5rem 0 1rem;
}
.section-head h2 {
  font-size: 0.85rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin: 0;
  color: var(--ink);
}
.section-head span {
  font-size: 0.75rem;
  color: var(--muted);
}

.field {
  margin-bottom: 1.5rem;
}
.field label {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 0.4rem;
}
.field input,
.field select {
  font: inherit;
  color: var(--ink);
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  padding: 0.5rem 0;
  width: 100%;
  outline: none;
  transition: border-color 150ms ease;
  appearance: none;
}
.field input::placeholder {
  color: #ccc;
}
.field input:focus,
.field select:focus {
  border-bottom-color: var(--ink);
}
.field select {
  background-image:
    linear-gradient(45deg, transparent 50%, var(--ink) 50%),
    linear-gradient(135deg, var(--ink) 50%, transparent 50%);
  background-position:
    calc(100% - 0.4rem) 60%,
    calc(100% - 0.1rem) 60%;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
  padding-right: 1.5rem;
  cursor: pointer;
}

.file-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.95rem;
  color: var(--muted);
  cursor: pointer;
  transition: border-color 150ms ease;
}
.file-trigger:hover,
.file-trigger:focus-within {
  border-bottom-color: var(--ink);
}
.file-trigger strong {
  color: var(--ink);
  font-weight: 500;
}
.file-trigger input[type="file"] {
  display: none;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem;
}
.grid-2 .field {
  margin-bottom: 0;
}

.btn-row {
  display: flex;
  gap: 0.5rem;
  margin-top: 2.5rem;
}
.btn-primary {
  flex: 1;
  padding: 0.5rem 1rem;
  background: var(--text);
  color: #fff;
  border: 1px solid var(--text);
  border-radius: var(--radius);
  font: inherit;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
  font-family: inherit;
}
.btn-primary:hover,
.btn-primary:focus-visible {
  background: #000;
  border-color: #000;
}
.btn-sm {
  padding: 0.3rem 0.6rem;
  font-size: 0.85rem;
}

.result {
  margin-top: 1.5rem;
  padding: 0.75rem 0;
  font-size: 0.9rem;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
}
.result:empty { display: none; }

@media (max-width: 720px) {
  article.page { padding: 2.5rem 1.2rem; }
  .grid-2 { grid-template-columns: 1fr; }
  .topbar { flex-direction: column; align-items: flex-start; gap: 0.3rem; }
}

/*  */
.card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.card-grid .card {
  background: var(--bg);
  padding: 1.4rem 1.5rem;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  min-height: 110px;
  transition: background 150ms ease, color 150ms ease;
}
.card-grid .card:hover,
.card-grid .card:focus-visible {
  background: var(--ink);
  color: var(--bg);
  outline: none;
}
.card-grid .card-title {
  font-size: 1rem;
  font-weight: 600;
  margin: 0;
  color: inherit;
}
.card-grid .card-desc {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0;
}
.card-grid .card:hover .card-desc,
.card-grid .card:focus-visible .card-desc {
  color: color-mix(in srgb, var(--bg) 70%, transparent);
}

/* === 进度条 === */
.progress {
  margin-top: 1.5rem;
  font-size: 0.85rem;
  color: var(--muted);
  min-height: 1.2em;
}
.progress-bar-bg {
  margin-top: 0.5rem;
  height: 2px;
  background: var(--line);
  overflow: hidden;
}
.progress-bar-bg > div {
  height: 100%;
  width: 0;
  background: var(--ink);
  transition: width 200ms ease;
}

/* === 关于页内容 === */
.about-content {
  line-height: 1.8;
  color: var(--ink);
  font-size: 0.95rem;
}
.about-content h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 2.5rem 0 0.8rem;
  color: var(--ink);
}
.about-content h3 {
  font-size: 1rem;
  font-weight: 600;
  margin: 2rem 0 0.6rem;
  color: var(--ink);
}
.about-content p {
  margin: 0 0 1rem;
  color: var(--muted);
}
.about-content a {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.qq-groups {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin: 1rem 0 1.5rem;
}
.qq-group {
  background: var(--bg);
  padding: 1rem 1.2rem;
  text-align: center;
}
.qq-group h4 {
  margin: 0 0 0.5rem;
  font-size: 0.8rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}
.qq-number {
  margin: 0;
  font-size: 1rem;
  font-weight: 500;
  font-family: 'Geist Mono', 'SF Mono', 'Consolas', monospace;
  color: var(--ink);
}
.qq-link {
  text-decoration: none;
  color: inherit;
  display: block;
}

/* === 画布/预览 === */
.canvas-container,
.preview-area {
  margin-top: 1.5rem;
  border: 1px solid var(--line);
  background: var(--bg);
  padding: 1rem;
  display: flex;
  justify-content: center;
}
.canvas-container canvas,
.preview-area canvas {
  max-width: 100%;
  height: auto;
  display: block;
  border: 0;
}
.preview-controls,
.controls {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 1.5rem;
}
.preview-controls button,
.controls button,
.btn-secondary {
  padding: 0.5rem 1rem;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font: inherit;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
  font-family: inherit;
}
.preview-controls button:hover,
.controls button:hover,
.btn-secondary:hover {
  border-color: var(--text);
}
.preview-controls button:disabled,
.controls button:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}
.preview-controls button.active,
.controls button.active,
.btn-secondary.active {
  background: var(--text);
  color: #fff;
  border-color: var(--text);
}

/* === 复选框 === */
.checkbox-field {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--ink);
  margin-bottom: 1rem;
  cursor: pointer;
}
.checkbox-field input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--ink);
  cursor: pointer;
}

/* === 工具页脚链接 === */
.page-foot {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--muted);
}
.page-foot a {
  color: var(--muted);
  text-decoration: none;
  transition: color 150ms ease;
}
.page-foot a:hover {
  color: var(--ink);
}
.page-foot .sep {
  margin: 0 0.5rem;
  color: var(--line);
}

@media (max-width: 720px) {
  .card-grid { grid-template-columns: 1fr; }
  .qq-groups { grid-template-columns: 1fr; }
  .resource-grid { grid-template-columns: 1fr; }
  .info-grid { grid-template-columns: 1fr; }
}

@media (max-width: 1024px) and (min-width: 721px) {
  .resource-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* === 资源卡片网格（主页面） === */
.resource-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.resource-card {
  background: var(--bg);
  padding: 1.3rem 1.4rem 1.1rem;
  min-height: 170px;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  text-decoration: none;
  color: inherit;
  position: relative;
  transition: background 150ms ease, color 150ms ease;
}
.resource-card:hover,
.resource-card:focus-visible {
  background: var(--ink);
  color: var(--bg);
  outline: none;
}
.resource-card .num {
  position: absolute;
  top: 0.9rem;
  right: 1.1rem;
  font-family: 'Geist Mono', 'SF Mono', 'Consolas', monospace;
  font-size: 0.7rem;
  color: var(--muted);
  letter-spacing: 0.1em;
}
.resource-card .meta {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin-bottom: 0.2rem;
}
.resource-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0;
  color: inherit;
}
.resource-card .desc {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0;
  line-height: 1.55;
  flex: 1;
}
.resource-card .url {
  font-family: 'Geist Mono', 'SF Mono', 'Consolas', monospace;
  font-size: 0.72rem;
  color: var(--muted);
  margin-top: 0.6rem;
  word-break: break-all;
}
.resource-card:hover .num,
.resource-card:hover .meta,
.resource-card:hover .desc,
.resource-card:hover .url,
.resource-card:focus-visible .num,
.resource-card:focus-visible .meta,
.resource-card:focus-visible .desc,
.resource-card:focus-visible .url {
  color: color-mix(in srgb, var(--bg) 65%, transparent);
}

/* === 信息面板 === */
.info-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.info-card {
  background: var(--bg);
  padding: 1.3rem 1.4rem;
  display: block;
  text-decoration: none;
  color: inherit;
  transition: background 150ms ease, color 150ms ease;
}
a.info-card {
  cursor: pointer;
}
a.info-card:hover,
a.info-card:focus-visible {
  background: var(--ink);
  color: var(--bg);
  outline: none;
}
.info-card h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin: 0 0 0.4rem;
  color: inherit;
}
.info-card p {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0;
  line-height: 1.6;
}
a.info-card:hover p,
a.info-card:focus-visible p {
  color: color-mix(in srgb, var(--bg) 65%, transparent);
}